JPH0130845B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides an apparatus for efficiently removing volatile substances such as solvents and monomers contained in polymers such as styrene polymers in a short time. It is related to.

[Prior art]

Polymers such as styrene polymers sent out from the polymerization process are rarely completely reacted, and the polymers usually contain volatile substances such as unreacted monomers and solvents. . Since these volatile substances reduce or deteriorate the quality of the polymer and further deteriorate the quality of products obtained from this polymer, they must be removed as soon as possible. Therefore, in order to improve the quality of the polymer, the polymer transferred from the polymer production process is treated with a volatile substance removal device.

This device for removing volatile substances is a device (Japanese Patent Publication No. 49-29797, Japanese Patent Publication No. 49-29797) that foams the polymer, disperses it, raises the temperature through a rigid multi-tubular heat exchanger, and flashes it in a gas-liquid separation zone. 134781) is known.

However, these devices It is necessary to foam the polymer.

The removal efficiency of volatile substances is not sufficient.

The device as a whole had drawbacks such as being large and complicated.

For this reason, the present inventors installed a plate-fin type heat exchanger in the main body that can reduce the pressure, and after exchanging heat between the polymer and the heat medium with this heat exchanger, the polymer flows out into the main body. A device for removing volatile substances from polymers (patent application No. 59-217266)
No.).

By the way, since the heat exchanger shown in this application is disposed inside the main body that is depressurized, the main body is inevitably large, and as a result, the construction cost increases and the installation area increases.

[Purpose of the invention]

The present invention solves the drawbacks of the conventional devices for removing volatile substances from polymers such as styrene polymers, has extremely high heat exchange efficiency, can be processed in a short time, and does not require increased costs or equipment. The object of the present invention is to provide an apparatus for removing volatile substances from polymers, which is designed to reduce the installation area.

[Summary of the invention]

In order to achieve the above object, the present invention comprises a plate-fin type heat exchanger having a main body capable of reducing pressure, a heat medium passage, and a polymer passage orthogonal to the heat medium passage, The device for removing volatile substances in a polymer is characterized in that the main body is fixed to the outside above the main body with a discharge port for the polymer being opened inside, and in a preferred embodiment, the main body has an upper is reduced to form an inclined surface, and the heat exchanger is provided along the inclined surface.

〔Example〕

Hereinafter, the polymer of the present invention will be explained with reference to the drawings.

FIG. 1 is a side sectional view showing an outline of a volatile substance removal device according to an embodiment of the present invention, in which a heat exchange device 3 is provided on the upper part of a main body 1 having a jacket 2. . Specifically, the heat medium H is supplied to the jacket 2 from a supply port 4 provided at the bottom thereof, and is discharged from a discharge port 5 to heat the wall surface of the main body 1. As the heat exchange device 3, a plate-fin type heat exchanger 6 is particularly used, and this heat exchanger 6 is provided so that a horizontal passage through which the heat medium H passes and a vertical passage through which the polymer P passes are orthogonal. The heat medium H is supplied to the horizontal passage through a supply pipe 7 and discharged through a discharge pipe 8. On the other hand, polymer P is
The polymer is supplied via the pump 10 and piping 11 to the polymer supply chamber 9 provided at the top of the heat exchanger 6, dispersed, heated via the vertical passage of the heat exchanger 6, and then brought to a reduced pressure state. A polymer stream p is ejected into a certain body 1 and flows down the central part of the body 1, that is, without passing through the inner side wall of the body 1.

As shown in FIGS. 2 to 6, the heat exchange device 3 includes heat medium chambers 15 on both sides of a horizontal passage of a plate-fin type heat exchanger 6, and a supply pipe 7 and a discharge pipe 8, respectively. is connected. A polymer supply chamber 9 is provided in the upper part on the vertical passage side, and a pipe 11 for supplying the polymer P is connected thereto. The plate fin type heat exchanger 6 is shown in FIGS. 5 and 6.
As shown in the figure, metal plates 16A and 17A each having an uneven or corrugated cross section are used as separators 1.
The metal plate 16A forms a large number of vertical passages 16, and the metal plate 17A forms a large number of horizontal passages 17. Therefore, the vertical and horizontal passages are opened in the shape of a honeycomb. For example, when looking at the vertical passage 16, the polymer P flows in the heat exchanger 6 in the form of many strings, and the polymer P flows through the heat exchanger 6 at the exit of the vertical passage 16. It is discharged into the main body 1, which is maintained in a reduced pressure state, in the form of a sheet or a thick string.

In this case, the polymer P is efficiently heated by the heat medium H flowing in the adjacent horizontal passage 17 while passing through the vertical passage 16, and its viscosity is reduced to a predetermined range. The situation is such that the volatile substances contained in the fuel are easily discharged. When the polymer P whose viscosity has been reduced in this way is discharged as a polymer stream P into the main body 1 maintained in a reduced pressure state, volatile substances are instantaneously evaporated (or flashed) from inside the main body 1. The polymer stream p descends in the center of the main body 1 in the form of a fluff, and is discharged from the discharge outlet 19 provided at the lower part thereof. In addition, volatile substances B evaporated from the polymer stream P are discharged from the outlet 20.
The waste is then discharged and treated as necessary.

FIGS. 7 and 8 show other embodiments of the apparatus for removing volatile substances from polymers according to the present invention, which are suitable for processing a large amount of polymer P. In these figures, the same reference numerals as in FIGS. 1 to 6 indicate the same names.

In this embodiment, the upper part of the main body 21 is formed by a downwardly expanding inclined wall 21', and a plurality of heat exchange devices 22 are provided on this inclined wall 21'. The inclination angle θ of the inclined wall 21' is set so that the polymer P, which will be described later, does not propagate along the inner side wall of the main body 21.

Note that the heat exchange device 22 may be installed on a vertical wall, but in order to quickly extract the polymer from the bottom and to reduce the thermal effect caused by heat retention heating from the wall surface, it is preferable to discharge it from a plate-fin type heat exchanger. It is desirable to mount it in such a way that the polymer material applied to it does not travel along the side wall.

The heat exchange device 22 is provided with a supply pipe 23 and a discharge pipe 24 for the heat medium H at the upper and lower parts thereof, respectively, and a supply chamber 25 for the polymer P. The heat exchange section 26 of the heat medium H is composed of a polymer P, and the heat exchange section 26 is composed of a horizontal passage and a vertical passage (specifically, FIGS. 5 and 6) as described in the first embodiment, and the horizontal passage is a polymer P. P, and a heat medium H is supplied to the vertical passage.

In this embodiment, the polymer P heated in the heat exchange section 26 and whose viscosity has been reduced is discharged as a polymer stream p into the main body 21 maintained in a reduced pressure state. '', it does not travel along the inner side wall of the central portion 21'' of the main body 21.

〔Effect of the invention〕

As explained above, according to the device for removing volatile substances in polymers according to the present invention, the heat exchange device is configured using a plate-fin type heat exchange volatile substance, so that the device for removing volatile substances from polymers can be heated. The state is as if it were directly heated by the medium, and the heating efficiency is extremely good. As a result, the polymer can be heat-treated in a short time.

The heat exchange device is attached to the outside of the main body where a reduced pressure state is maintained, and the structure is such that the polymer heated by the heat exchange device does not propagate through the internal side walls of the main body, making it possible to downsize the main body. Therefore, not only can construction costs be reduced and the installation area reduced, but even if a leak occurs in the heating medium piping, the heating medium will not be mixed into the polymer, and as a result, the product There is no risk of degrading the quality of the product.

It has the following effects.

[Brief explanation of drawings]

FIGS. 1 to 8 show examples of the device for removing volatile substances in polymers according to the present invention,
Fig. 1 is a schematic front sectional view, Fig. 2 is a side view of the heat exchanger, Fig. 3 is a plan view of the heat exchanger, Fig. 4 is a bottom view of the same, Fig. 5
The figure is an enlarged view of part A in Fig. 4, and Fig. 6 is an enlarged view of section A in Fig. 5.
It is a sectional view taken along the Y arrow. 7 and 8 show a second embodiment of the apparatus for removing volatile substances in polymers according to the present invention, with FIG. 7 being a schematic front sectional view thereof and FIG. 8 being a plan view thereof. 1, 21...Body, 2...Jacket, 3,2
2... Heat exchange device, 4... Supply port, 5... Discharge port, 6... Heat exchanger, 7, 23... Supply pipe, 8,
24...Discharge pipe, 9, 25...Polymer supply chamber, 1
0...Pump, 11...Piping, 15...Heat medium chamber, 16...Vertical passage, 17...Horizontal passage, 18...
Separator, 21'... Inclined wall, 26... Heat exchange section, P... Polymer, p... Polymer flow, H... Heat medium.

Claims (1)

[Claims] 1. A plate-fin type heat exchanger having a main body capable of reducing pressure, a heat medium passage, and a polymer passage orthogonal to the heat medium passage, and the heat exchanger is installed above the main body. 1. An apparatus for removing volatile substances in a polymer, characterized in that the device is fixed to the outside with a discharge port for the polymer opened inward. 2. The removal of volatile substances from a polymer according to claim 1, wherein the main body has an upper part reduced to form an inclined surface, and the heat exchanger is provided along the inclined surface. Device.